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We used 36 Santa In\u00eas male lambs, with an age of 4 months and an initial body weight of 18.60\u00a0kg\u2009\u00b1\u20093.80\u00a0kg, confined for 71 days, with 15 days of adaptation and 56 days of data collection. The animals were distributed in a completely randomized design in four treatments. Dietary treatments consisted of replacing TH with PH at increasing levels (0%, 33%, 67%, and 100%) within the dry matter of the roughage fraction, maintaining a 40:60 roughage-to-concentrate ratio in the total mixed ration. Dry matter (DM), organic matter, and non-fibrous carbohydrates intake increased (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&lt;\u20090.01) by replacing TH with PH. However, there were decreases (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&lt;\u20090.01) in the crude protein and neutral detergent insoluble fiber digestibility coefficients of the diet with increasing PH levels. The final weight, daily gain, and feed conversion of the lambs were 30.96\u00a0kg, 0.26\u00a0kg\/day, and 4.38\u00a0kg\/kg, respectively; the increase in PH in the diet did not affect (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&gt;\u20090.05) these values. Conversely, hot and cold carcass weights and yields increased (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&lt;\u20090.01) with the dietary replacement of TH by PH. In contrast, TH replacement did not affect (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&gt;\u20090.05) the regional carcass composition of the lambs. Furthermore, the substitution of TH with PH had no impact (\n                    <jats:italic>P<\/jats:italic>\n                    \u2009&gt;\u20090.05) on meat color, water-holding capacity, tenderness, or chemical composition (i.e., ash, protein, and fat contents). We recommend completely replacing Tifton 85 hay with Pornun\u00e7a hay in the diet of feedlot lambs.\n                  <\/jats:p>","DOI":"10.1007\/s11250-026-05347-5","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T15:33:12Z","timestamp":1790004792000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Comparative effect of feeding Tifton 85 hay and Pornun\u00e7a hay as roughage on the performance, carcass characteristics, and meat quality of feedlot lambs"],"prefix":"10.1007","volume":"58","author":[{"given":"Maria Cl\u00e1udia Soares Cruz","family":"Coelho","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carla Wanderley","family":"Mattos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gherman Garcia Leal","family":"de Ara\u00fajo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kelly Cristina","family":"dos Santos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matheus Henrique Andrade de","family":"Silva","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jo\u00e3o Paulo Ism\u00e9rio dos Santos","family":"Monnerat","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luciana Felizardo Pereira","family":"Soares","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andreia Fernandes","family":"de Souza","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria Alyne Coutinho","family":"Santos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1154-8579","authenticated-orcid":false,"given":"Dorgival Morais","family":"de Lima J\u00fanior","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Francisco Fernando Ramos","family":"de Carvalho","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,21]]},"reference":[{"issue":"1","key":"5347_CR1","doi-asserted-by":"publisher","first-page":"41","DOI":"10.5194\/aab-62-41-2019","volume":"62","author":"Y Aksoy","year":"2019","unstructured":"Aksoy Y, \u00c7i\u00e7ek \u00dc, \u015een U, \u015eirin E, U\u011furlu M, \u00d6nen\u00e7 A, Kuran M, Uluta\u015f Z (2019) Meat production characteristics of Turkish native breeds: II. meat quality, fatty acid, and cholesterol profile of lambs. 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